Keysight Technologies X-Series, Руководство по программированию

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Keysight CXG, EXG, and MXG X-Series Signal Generators Programming Guide 223
Creating and Downloading Waveform Files
Non–Volatile Memory
Non–volatile files are stored on the non–volatile internal signal generator
memory (internal storage) or to an USB media, if available.
The non–volatile internal memory is allocated according to a Microsoft
compatible file allocation table (FAT) file system. The signal generator allocates
non–volatile memory in clusters according to the drive size (see Table on
page 223 ). For example, referring to Table on page 223 , if the drive size is 15
MB and if the file is less than or equal to 4K bytes, the file uses only one 4 KB
cluster of memory. For files larger than 4 KB, and with a drive size of 15 MB,
the signal generator allocates additional memory in multiples of 4KB clusters.
For example, a file that has 21,538 bytes consumes 6 memory clusters (24,000
bytes).
For more information on default cluster sizes for FAT file structures, refer to
Table on page 223 and to http://support.microsoft.com/ .
If the signal generator’s external USB flash memory port is used, the USB
flash memory can provide actual physical storage of non–volatile data in
the SECUREWAVE directory versus the “virtual” only data.
ARB waveform encryption of proprietary information is supported on the
external non–volatile USB flash memory.
To copy
unencrypted data files from an external media (as in USB Flash
Drive [UFD]) for playing on a signal generator, the full filename extension is
required (i.e. .MARKER, .HEADER, .WAVEFORM, etc.). For more information
on unencrypted data, refer to “Commands for Downloading and Extracting
Waveform Data” on page 225 . For more information on how to work with
files, refer to the User’s Guide.
To copy
compatible licensed
encrypted data files (i.e. .
SECUREWAVE
) from an
external media, download (copy) the files to the signal generator (refer to the
User’s Guide for information on how to work with files). When using the external
media along with the signal generator’s
Use as
or
Copy File to Instrument
softkey menus, encrypted data files can be automatically detected by the signal
generator, regardless of the suffix (e.g. .wfm, .wvfm, and
no suffix
, etc.). These
various waveform files can be selected and played by the signal generator. For
more information on encrypted data, refer to
“Commands for Downloading and
Extracting Waveform Data” on page 225
. When using the
Copy File to
Instrument
, the signal generator prompts the user to select between BBG
Memory and Internal Storage memories as locations to copy the files.
Table 5-3 Drive Size (logical volume)
Drive Size (logical volume) Cluster Size (Bytes)
(Minimum Allocation Size)
0 MB – 15 MB 4K
16 MB – 127 MB 2K